Notes from the deliverability lab.
Are pre-warmed mailboxes worth it? An honest cost-vs-time breakdown
Pre-warmed mailboxes cost $5/mo vs $2.50 for standard, and they let you send cold on day one instead of waiting 14 days. Here is exactly when the premium pays off, and when it does not.
The InboxLee TeamJul 4, 2026 · 6 min readHow a private equity outreach team manages cold email at scale
A boutique PE firm runs deal sourcing through cold email. Their infrastructure stack and operational rhythm.
The InboxLee TeamNov 14Rolling out 200 mailboxes across 67 domains for a B2B agency
A 14-person lead-gen agency moved off self-managed Workspace to InboxLee. The migration timeline and lessons learned.
The InboxLee TeamNov 5A founder running their own cold outreach: the minimum viable stack
Single-person sales, low volume, B2B SaaS. The simplest cold-email stack that still works in 2026.
The InboxLee TeamOct 28How a tech recruiter runs cold candidate outreach without burning their domain
Recruiting outreach has higher reply rates than sales - and different deliverability dynamics. The nuances.
The InboxLee TeamOct 20Multi-language cold email: setting up infrastructure for 5 markets
A SaaS company sells into Germany, France, Spain, Italy, and the UK. Their cold-email infrastructure splits per market.
The InboxLee TeamOct 12Rebuilding a cold-email program after a compliance incident
A B2B sales team had a domain blacklisted after a sloppy campaign. The rebuild took 90 days. Here is what they did.
The InboxLee TeamOct 4